Printed circuit board having solder bridges for electronically connecting conducting pads and method of fabricating solder bridges

ABSTRACT

A method of fabricating a zero signal degradation solder bridge electrical connection for connecting adjacent conducting pads of a printed circuit board, and a printed circuit board having at least one of these solder bridge electrical connections. In the method, a stencil, having an opening that corresponds to the adjacent conducting pads and at least a portion of the surface area of the printed circuit board between the adjacent conducting pads, is placed on the surface of printed circuit board. Solder paste is then applied to the stencil such that the solder paste flows through the stencil opening and onto the adjacent conducting pads and at least a portion of the surface area of the printed circuit board between the pads. The stencil is then removed and the printed circuit board is subjected to reflow soldering, thereby fabricating a printed circuit board having a solder bridge electrical connector between adjacent conducting pads.

BACKGROUND OF THE INVENTION

This invention relates to printed circuit boards. In particular, thepresent invention is a method of fabricating a high signal integrity,“solder bridge” electrical connection for connecting conducting pads ofa printed circuit board, and a printed circuit board having at least onesolder bridge for electronically connecting adjacent printed circuitboard conducting pads. The solder bridge forms a reliable and secureelectrical connection between adjacent conducting pads without the needfor electronic components such as zero ohm resistors, dip switchesand/or jumper block/header arrays.

Printed circuit boards (PCB's) with electrical components are widelyused in the electronics industry in a variety of products includingcomputers, televisions and telecommunication devices. PCB's aretypically manufactured in a two step process. First, the actual PCB“blank” is fabricated from multiple layers of materials and coppertraces. The copper traces typically terminate in conductingthrough-holes or conducting pads to which electrical components can beattached to the PCB blank. In the second part of the PCB manufacturingprocess, these electrical components, such as resistors capacitors,microchips, etc. are attached to the PCB blank. Through-hole electricalcomponents are generally attached to the conducting through holes of thePCB blank using through-hole processes, while surface mount electricalcomponents are attached to the conducting pads of the PCB blank usingsurface mount processes.

In typical through-hole mounting processes, the leads of the electricalcomponents are passed through the conducting through-holes in the PCBblank so that the ends of the leads extend beyond a bottom side of thePCB blank. The ends of the leads are then soldered to the bottom side ofthe PCB blank by a solder wave in which molten solder flows across thebottom side of the PCB blank. The molten solder fills the voids betweenthe electrical component leads and the conducting through-holes to formconductive bonds between the leads and the conducting through-holes onthe PCB blank.

In typical surface mounting processes, a solder paste is applied to theconducting pads of the PCB blank through a stencil patterned withopenings corresponding to the PCB blank conducting pad locations.Typically, the solder paste is screen deposited onto the conducting padsusing the stencil as a mask and a blade to squeegee the solder pastethrough the holes in the stencil. When the stencil is removed, thesolder paste remains on the conducting pads of the PCB blank. Next, theleads of the electrical components are placed on the soldered conductingpads, and the solder paste is subjected to reflow soldering to adherethe leads to the conducting pads. To prevent solder shorts (i.e., theunwanted formation of an electrical connection between conducting pads),due to the imprecise application of the soldering paste or the unwantedflow of solder during the reflow soldering process, the conducting padsare often fabricated on the PCB blank so as to have an edge-to-edgeconducting pad separation of between 20-100 mils with a minimumedge-to-edge conducting pad separation of at least 12 mils.

During the process of mounting electrical components to the PCB blank,it is often necessary to simply electrically connect conducting pads toone another with acceptable parasitic capacitance and inductance.Typically, to electrically connect conducting pads in this fashion, itis necessary to use a “load/no-load” process to mount a separateelectrical component to the PCB blank after the application of thesoldering paste and before the reflow soldering procedure. Types ofcomponents that are typically used are “zero ohm resistors”, “dipswitches” and “header array/jumper blocks”.

Although any one or all of these components can provide the desiredelectrical connection between conducting pads there are drawbacks to theuse of these types of electrical components. For example, all of thesesolutions to providing an electrical connection, with acceptableparasitic capacitance and inductance, between conducting pads requiresthe use of separate electrical components (i.e., extra parts). Theseextra parts increase the overall cost of manufacturing the PCB.Moreover, these extra parts are susceptible to damage during routinehandling of the PCB that may adversely affect the operation of the PCB.In addition, these extra parts are susceptible to becoming dislodged orinadvertently misaligned during the reflow soldering process which canadversely affect the electrical connection formed by these separateelectrical components and the subsequent operation of the PCB. Further,these separate electrical components take up valuable PCB surface areaand degrade the integrity of the electrical signal between the conductorpads connected by these components. Still further, PCB's employing theseseparate electrical components are not easily reconfigurable during thePCB manufacturing process, since to accomplish such a task typicallyrequires the addition of automated equipment and/or the reprogramming ofautomated equipment for mounting these components onto the PCB blank inthe desired reconfigured format. Lastly, the design of these separateelectrical components limits their PCB mounting configurations, and assuch, typically necessitates that these components be mounted to the PCBeither parallel (i.e., 180°) or at a 90° angle with respect to othercomponents on the PCB.

There is a need for PCB's having substantially zero signal degradationelectrical connections that minimize parasitic capacitance andinductance between connected conducting pads, and a method offabricating such substantially zero signal degradation electricalconnections between conducting pads of a PCB. In particular, there is aneed for PCB's having these substantially zero signal degradationelectrical connections and a method of fabricating these electricalconnections between conducting pads that does not require the use ofseparate electrical components (such as “zero ohm resistors”, “dipswitches” and “header array/jumper blocks) and thereby reduces the costof manufacturing the PCB. These substantially zero signal degradationelectrical connections should not be susceptible to damage duringroutine handling of the PCB that may adversely affect the operation ofthe PCB. In addition, these substantially zero signal degradationelectrical connections should not be susceptible to becoming dislodgedor inadvertently misaligned during the PCB manufacturing process.Further, these substantially zero signal degradation electricalconnections should not take up valuable PCB surface area, nor shouldthese electrical connections degrade the integrity of the electricalsignal between connected PCB conducting pads. Still further, it shouldbe relatively easy to reconfigure the PCB during the manufacturingprocess to eliminate, add or change the configuration of thesesubstantially zero signal degradation electrical connections withoutadding automated equipment and/or reprogramming automated equipment formounting electrical components onto the PCB blank. Lastly, thesesubstantially zero signal degradation electrical connections should berotatable through any angle so as to be mountable to the PCB at anyangle (not just 90° and 180°) to allow the PCB to employ variousconducting pad geometries and groupings to take advantage of availablePCB surface space.

SUMMARY OF THE INVENTION

The present invention is a printed circuit board product comprising adielectric structure core having a first surface. At least twoconducting pads are located on the first surface of the dielectricstructure core. The at least two conducting pads are separated by a padedge-to-pad edge separation distance of less than 12 mils.

In one aspect of the present invention the pad edge-to-pad edgeseparation distance is 8 mils. In another aspect of the presentinvention, the at least two conducting pads are defined by a firstconducting pad having an edge and a second conducting pad having anedge. The edge of the second conducting pad is separated from butadjacent to the edge of the first conducting pad such that the edges ofthe first and second conducting pads define therebetween a surface areaof the first surface of the dielectric structure core. In a furtheraspect of the present invention, a solder bridge at least partiallycovers this surface area to form a substantially zero signal degradationelectrical connection between the first and second conducting pads. Instill another aspect of the present invention, the solder bridge coverssubstantially all of the surface area of the first surface of thedielectric structure core defined between the edges of the first andsecond conducting pads.

In another embodiment, the present invention provides a printed circuitboard product comprising a dielectric structure core having a firstsurface. At least two conducting pads are located on the first surfaceof the dielectric structure core. A solder bridge electrically connectsthe at least two conducting pads.

In a further embodiment, the present invention provides a method offabricating a substantially zero signal degradation electricalconnection on a printed circuit board. The method includes providing aprinted circuit board defined by a dielectric structure core having afirst surface. The first surface includes a first conducting pad havingan edge and a second conducting pad having an edge separated from andadjacent to the edge of the first conducting pad. The edges of the firstand second conducting pads define therebetween a surface area of thefirst surface. The method further includes applying a solder paste onthe first and second conducting pads and on the first surface of thedielectric structure core. The solder paste at least partially coversthe surface area of the first surface between the edges of the first andsecond conducting pads to form a substantially zero signal degradationelectrical connection between the first and second conducting pads.

In one aspect of the invention, the solder paste covers the entiresurface area of the first surface between the edges of the first andsecond conducting pads. In another aspect of the invention, the solderpaste is applied through an opening within a stencil that has beenplaced atop the first surface of the dielectric structure core.

In still another embodiment, the present invention provides a stencildevice for insuring that solder paste is accurately applied to a printedcircuit board to create a substantially zero signal degradation solderbridge electrical connection. The printed circuit board is defined by adielectric structure core having a first surface. The first surfaceincludes a first conducting pad having an edge and a second conductingpad having an edge separated from and adjacent to the edge of the firstconducting pad. The edges of the first and second conducting pads definetherebetween a surface area of the first surface. The stencil devicecomprises a stencil plate member defining a first opening sized tosubstantially correspond to the first conducting pad, a second openingsized to substantially correspond to the second conducting pad and athird opening that links the first opening to the second opening and issized to correspond to a partial portion of the surface area of thefirst surface between the edges of the first and second conducting pads.Upon application of solder paste to the stencil plate member, the solderpaste flows through the first, second and third openings onto the firstand second conducting pads and the first surface of the dielectricstructure core to form a substantially zero signal degradationelectrical connection between the first and second conducting pads.

In still a further embodiment, the stencil plate member defines anopening sized to substantially correspond to the first conducting pad,the second conducting pad and substantially the entire surface area ofthe first surface between the edges of the first and second conductingpads. Upon application of solder paste to the stencil plate member, thesolder paste flows through the opening onto the first and secondconducting pads and the first surface of the dielectric structure coreto form a substantially zero signal degradation electrical connectionbetween the first and second conducting pads.

The method of fabricating a zero signal degradation solder bridgeelectrical connection for connecting conducting pads of a printedcircuit board, and a printed circuit board having at least one of thesesolder bridges of the present invention does not require the use ofseparate electrical components (such as “zero ohm resistors”, “dipswitches” and “header array/jumper blocks”). As such the cost offabricating such a printed circuit board is reduced. In addition, sincethis zero signal degradation solder bridge electrical connection hassuch a low profile, it is not susceptible to damage during routinehandling, nor is it susceptible to becoming dislodged or inadvertentlymisaligned during the printed circuit board manufacturing process.Moreover, since the zero signal degradation solder bridge electricalconnection forms a short, direct electrical connection between theconducting pads, degradation of the integrity of the electrical signaland parasitic capacitance and inductance between connected conductingpads is minimized especially when compared to the separate electricalcomponents referred to above. Further, it is relatively easy toreconfigure the printed circuit board during the manufacturing processsince the reconfiguring of any zero signal degradation electricalconnections only requires modification of the stencil which may in someinstances be accomplished simply by masking off with tape unwantedsolder bridge connections on the stencil. Lastly, these substantiallyzero signal degradation electrical connections are rotatable through anyangle so as to be mountable to the printed circuit board at any angle(not just 90° and 180°) to allow the printed circuit board to employvarious conducting pad geometries and groupings to take advantage ofavailable printed circuit board surface space.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the present invention and are incorporated in andconstitute a part of this specification. The drawings illustrate theembodiments of the present invention and together with the descriptionserve to explain the principals of the invention. Other embodiments ofthe present invention and many of the intended advantages of the presentinvention will be readily appreciated as the same become betterunderstood by reference to the following detailed description whenconsidered in connection with the accompanying drawings, in which likereference numerals designate like parts throughout the figures thereof,and wherein:

FIG. 1 is a top elevational view illustrating a portion of a printedcircuit board having a plurality of conducting pads.

FIG. 2 is a top elevational view similar to FIG. 1 illustrating apreferred embodiment of the substantially zero signal degradation solderbridge electrical connector for electrically connecting adjacentconducting pads in accordance with the present invention.

FIG. 3 is a top elevational view similar to FIG. 1 illustrating analternative embodiment of the substantially zero signal degradationsolder bridge electrical connector for electrically connecting adjacentconducting pads in accordance with the present invention.

FIG. 4 is a sectional view taken along line 4—4 in FIG. 1.

FIG. 5 is a sectional view taken along line 5—5 in FIG. 2 illustratingthe preferred embodiment of the substantially zero signal degradationsolder bridge electrical connection.

FIG. 6 is a sectional view taken along line 6—6 in FIG. 3 illustratingthe alternative embodiment of the substantially zero signal degradationsolder bridge electrical connection.

FIG. 7 is a top elevational view illustrating a stencil, in accordancewith the present invention, for fabricating the substantially zerosignal degradation solder bridge electrical connections illustrated inFIGS. 2 and 3.

FIG. 8 is a top elevational view similar to FIG. 7 of the stencil withan opening masked off with tape.

FIG. 9 is a sectional view similar to FIG. 5 illustrating a method offabricating the preferred embodiment of the substantially zero signaldegradation solder bridge electrical connection using the stencil shownin FIG. 8.

FIG. 10 is a flow chart illustrating the method of fabricating thesubstantially zero signal degradation solder bridge electricalconnection in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1 and 4 illustrate a portion of a printed circuit board blank orproduct 10, in accordance with the present invention, defined by adielectric structure core 12 having a first surface 14 and an oppositesecond surface 16 (see FIG. 4). As seen best in FIG. 1, the firstsurface 14 of the dielectric structure core 12 includes a plurality ofconducting pads 18, 20, 22, 24, 26 and 28. In one preferred embodiment,the conducting pads 18-28 are copper traces that have been selectivelypatterned on the first surface 14 of the dielectric structure core 12using conventional photolithographic processes. It is to be understoodthat although only six conducting pads 18-28 are illustrated, theprinted circuit board product 10 can have any number of these conductingpads.

The present invention will now be described with reference to adjacentconducting pads 18 and 20, but it is to be understood that the followingapplies to any adjacent pair of conducting pads 18-28. As seen best inFIG. 1, first conducting pad 18 has an adjoining edge 30 that isseparated from but immediately adjacent to an adjoining edge 32 ofsecond conducting pad 20. The adjoining edges 30 and 32 of the first andsecond conducting pads 18 and 20 define therebetween a surface area 34(represented by the “X” area in FIG. 1) of the first surface 14 of thedielectric structure core 12.

In one preferred embodiment, each of the conducting pads 18-28 isgenerally square having an edge length of 30 mils. Further, in oneembodiment, the adjoining edges 30 and 32 of the first and secondconducting pads 18 and 20, respectively, are separated by a pad edge 30to pad edge 32 separation distance “D” (see FIG. 1) of less than 12mils. Ideally, this pad edge-to-pad edge separation distance “D” isbetween 3 mils. and 10 mils., with the preferred pad edge-to-pad edgeseparation distance “D” being 8 mils. As such the surface area 34between the adjoining edges 30, 32 of the first and second conductingpads 18, 20 is approximately 240 square mils.

In prior art printed circuit boards, the pad edge-to-pad edge separationdistance “D” is typically between 20-100 mils with a minimum padedge-to-pad edge separation distance “D” of 12 mils. As such, the ideal8 mils. pad edge-to-pad edge separation distance “D” of the preferredembodiment of the present invention allows for a more compact printedcircuit board design.

FIGS. 2 and 5 illustrate a preferred embodiment of a substantially zerosignal degradation solder bridge electrical connection 36 (speckled areain FIGS. 2 and 5), in accordance with the present invention, forelectrically connecting together the first and second conducting pads18, 20 to permit signal transmission therebetween. As seen best in FIG.2, the substantially zero signal degradation solder bridge electricalconnection 36 substantially covers the first and second conducting pads18, 20 and substantially all of the surface area 34 of the first surface14 of the dielectric structure core 14 between the adjoining edges 30,32 of the pads 18, 20. As seen in FIG. 5, this solder bridge 36 extendsover upper surfaces 38 and 40 of the conducting pads 18, 20,respectively, and over the first surface 14 of the dielectric structurecore 12 between the adjoining edges 30, 32. Fabrication of this solderbridge 36 will be described in detail below.

FIGS. 3 and 6 illustrate an alternative embodiment of a substantiallyzero signal degradation solder bridge electrical connection 42 (speckledarea in FIGS. 3 and 6), in accordance with the present invention, forelectrically connecting together the third and fourth conducting pads 26and 28 to permit signal transmission therebetween. As seen best in FIG.3, the substantially zero signal degradation solder bridge electricalconnection 42 substantially covers the third and fourth conducting pads26, 28 but only partially covers the surface area 34 of the firstsurface 14 of the dielectric structure core 14 between the adjoiningedges 30, 32 of the pads 26, 28. As seen in FIG. 5, this solder bridge42 extends over upper surfaces 38 and 40 of the conducting pads 26, 28,respectively, and over the first surface 14 of the dielectric structurecore 12 between the adjoining edges 30, 32. It is to be understood thatalthough the solder bridge 42 is shown centered on the conducting pads26, 28, the solder bridge 42 can be offset to one side or the other, orthe solder bridge 42 could extend diagonally between the pads 26, 28. Itis only important that the solder bridge 36, 42 bridge the surface area34 between the adjoining edges 30, 32 of the conducting pads 18-28.Fabrication of this solder bridge 42 will be described in detail below.

FIG. 7 illustrates a portion of a stencil plate member 44, in accordancewith the present invention for insuring that solder paste 46 (see FIG.9) is accurately applied to the first surface 14 of the dielectricstructure core 12 of the printed circuit board product 10 to fabricatethe substantially zero signal degradation solder bridge electricalconnections 36 and 42. As seen best in FIG. 9, the solder paste 46 isapplied in a known manner by way of a conventional solder pasteapplication mechanism 48. As seen in FIG. 7, the stencil plate member 44defines a first opening 50 sized to substantially correspond to thefirst conducting pad 18, the second conducting pad 20 and substantiallythe entire surface area 34 of the first surface 14 between the edges 30,32 of the first and second conducting pads 18, 20, such that uponapplication of solder paste 46 to the stencil plate member 44, thesolder paste 46 flows through the opening 50 and onto the first andsecond conducting pads 18, 20 and the first surface 14 of the dielectricstructure core 12 to form the substantially zero signal degradationelectrical connection 36 between the first and second conducting pads18, 20.

As seen in FIG. 7, the stencil plate member 44 also defines a secondopening 52 having a first open portion 54 sized to substantiallycorrespond to the third conducting pad 26, a second open portion 56sized to substantially correspond to the fourth conducting pad 28 and athird open portion 58 that links the first open portion 54 to the secondopen portion 56 and is sized to correspond to a partial portion of thesurface area 34 of the first surface 14 between the edges 30, 32 of thethird and fourth conducting pads 26, 28, such that upon application ofsolder paste 46 to the stencil plate member 44, the solder paste 46flows through the first, second and third open portions 54, 56, 58 ofthe second opening 52 and onto the third and fourth conducting pads 26,28 and the first surface 14 of the dielectric structure core 12 to formthe substantially zero signal degradation electrical connection 42between the third and fourth conducting pads 26, 28.

As seen in FIG. 8, it is relatively easy to reconfigure the printedcircuit board product 10 during the manufacturing process since thereconfiguring of any substantially zero signal degradation electricalconnections 36, 42 only requires modification of the stencil 44 whichmay in some instances be accomplished simply by masking off with tape 60unwanted solder bridge connection openings (such as solder bridgeconnection opening 52) on the stencil 44.

In practice, as illustrated in FIG. 10, the substantially zero signaldegradation solder bridge electrical connections 36, 42 are fabricatedusing the following method. First, as represented by reference numeral62, a printed circuit board product 10 defined by a dielectric structurecore 12 having a first surface 14, conducting pads 18-28 havingadjoining edges 30, 32 that define therebetween a surface area 34 of thefirst surface 14 is provided. Next, as represented by reference numeral64, if desired unwanted solder bridge fabricating openings 50, 52 in thestencil plate member 44 can be masked off using a piece of tape 60 toprevent solder paste from flowing through the these openings and ontoselect conducting pads 18-28. If it is not necessary to modify theprinted circuit board product 10, then this step 64 is simply omittedand fabrication proceeds with the next step 66. In step 66, the stencil44 is placed on the first surface 14 of the dielectric structure core 12with the solder bridge fabricating openings 50, 52 aligned with theappropriate conducting pads 18-28. In this example, the fabricatingopening 50 would be aligned with the first and second conducting pads18, 20, and the fabricating opening 52 would be aligned with the thirdand fourth conducting pads 26, 28.

Next, as represented by reference numeral 68, the solder paste 46 isapplied on the conducting pads 18, 20, 26, 28 and on the first surface14 of the dielectric structure core 12. The solder paste 46 appliedthrough the fabricating opening 50 covers the entire surface area 34between the adjoining edges of the pads 18, 20 (see FIG. 2). The solderpaste 46 applied through the fabricating opening 52 only partiallycovers the surface area 34 between the adjoining edges of the pads 18,20 (see FIG. 3). Next, as represented by reference numeral 70, thestencil 44 is removed from the first surface 14 of the dielectric core12 leaving the previously described solder paste bridge formations onthe pads 18, 20, 26, 28 and on the first surface 14. Last, asrepresented by reference numeral 72, reflow soldering of the solderpaste applied to the conducting pads 18, 20, 26, 28 and the surface area34 of the first surface 14 of the dielectric structure core 12 ispreformed, thereby fabricating the substantially zero signal degradationsolder bridge electrical connections 36, 42 between the conducting pads18, 20 and 26, 28 and completing the fabrication process.

The method of fabricating the substantially zero signal degradationsolder bridge electrical connections 36, 42 for connecting conductingpads 18-28 of the printed circuit board product 10, and the printedcircuit board 10 having at least one of these solder bridges 36, 42 inaccordance with the present invention do not require the use of separateelectrical components (such as “zero ohm resistors”, “dip switches” and“header array/jumper blocks”). As such the cost of fabricating such aprinted circuit board 10 is reduced. In addition, since thissubstantially zero signal degradation solder bridge electricalconnection 36, 42 has such a low profile, it is not susceptible todamage during routine handling, nor is it susceptible to becomingdislodged or inadvertently misaligned during the printed circuit boardmanufacturing process. Moreover, since the substantially zero signaldegradation solder bridge electrical connections 36, 42 form a short,direct electrical connection between the conducting pads 18-28,degradation of the integrity of the electrical signal and parasiticcapacitance and inductance between connected conducting pads isminimized especially when compared to the separate electrical componentsreferred to above. Further, it is relatively easy to reconfigure theprinted circuit board 10 during the manufacturing process since thereconfiguring of any substantially zero signal degradation electricalconnections only requires modification of the stencil 44 which may insome instances be accomplished simply by masking off with tape 60unwanted solder bridge fabrication openings 50, 52 in the stencil 44.Lastly, these substantially zero signal degradation electricalconnections 36, 42 are rotatable through any angle so as to be mountableto the printed circuit board 10 at any angle (not just 90° and 180°) toallow the printed circuit board 10 to employ various conducting padgeometries and groupings to take advantage of available printed circuitboard surface space.

Although the present invention has been described with reference topreferred embodiments, workers skilled in the art will recognize thatchanges may be made in form and detail without departing from the spiritand scope of the invention.

We claim:
 1. A printed circuit board product comprising: a dielectricstructure core having a first surface; and first and second conductingpads on the first surface of the dielectric structure core, wherein thefirst conducting pad has an edge and the second conducting pad has anedge adjacent to the edge of the first conducting pad and separated fromthe edge of the first conducting pad by a pad edge-to-pad edgeseparation distance of less than 12 mils., the edges of the first andsecond conducting pads defining therebetween a surface area of the firstsurface, wherein a solder bridge connects the first conducting pad tothe second conducting pad and only partially covers the surface area. 2.The printed circuit board product of claim 1 wherein the pad edge-to-padedge separation distance is 3 mils. to 10 mils.
 3. The printed circuitboard product of claim 2 wherein the pad edge-to-pad edge separationdistance is 8 mils.
 4. The printed circuit board product of claim 1wherein the solder bridge further includes: a substantially zero signaldegradation electrical connection between the first and secondconducting pads.
 5. The printed circuit board product of claim 4 whereinthe substantially zero signal degradation electrical connection issolder.
 6. A printed circuit board product comprising: a dielectricstructure core having a first surface; first and second conducting padson the first surface of the dielectric structure core, wherein eachconducting pad of the first and second conducting pads has an upperexposed surface, and wherein the first conducting pad has an edge andthe second conducting pad has an edge separated from and adjacent to theedge of the first conducting pad, the edges of the first and secondconducting pads defining a surface area of the first surfacetherebetween; and a solder bridge electrical connection extendingbetween and across the upper exposed surfaces of only the first andsecond conducting pads, wherein the solder bridge electrical connectionhas a uniform thickness on the upper exposed surface of each conductingpad, and wherein the solder bridge electrical connection only partiallycovers the surface area.
 7. The printed circuit board product of claim 6wherein the solder bridge electrical connection is a substantially zerosignal degradation electrical connection.
 8. The printed circuit boardproduct of claim 6 wherein the solder bridge electrical connection isformed from solder paste.
 9. The printed circuit board product of claim8 wherein the solder paste is applied to the first surface of thedielectric structure core through a stencil.
 10. A printed circuit boardproduct comprising: a dielectric structure core having a first surface;first and second conducting pads on the first surface of the dielectricstructure core, wherein each conducting pad of the first and secondconducting pads extends outward from the dielectric structure core so asto provide a plurality of exposed upstanding edges, and wherein theadjacent exposed upstanding edges define a surface area of the firstsurface therebetween; and a solder bridge electrical connectionextending between and connecting adjacent exposed upstanding edges ofthe plurality of exposed upstanding edges of only the first and secondconducting pads, and wherein the solder bridge electrical connectiononly partially covers the surface area.